Update node version in CONTRIBUTING.md

[scape76]

Contributing.md had an outdated version of node, that misses APIs for using cpy package in drizzle-seed build

Fixes #3707

[huuyafwww]

@scape76
Thanks for fixing it.
I was having the same problem as well.
Slightly unrelated to the original issue, but if possible, how about adding an additional fix to match the pnpm install version to the packageManager listed in package.json?
I think it would be a more helpful contribution guide if you specify the version of pnpm.

before fix.

# https://pnpm.io/installation
npm install -g pnpm

after fix.

# https://pnpm.io/installation
npm install -g pnpm@9.7.0